405454221 has 8 divisors (see below), whose sum is σ = 600672960. Its totient is φ = 270302796.

The previous prime is 405454219. The next prime is 405454229. The reversal of 405454221 is 122454504.

It is not a de Polignac number, because 405454221 - 2¹ = 405454219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15016823 = 405454221 / (4 + 0 + 5 + 4 + 5 + 4 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405454229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7508385 + ... + 7508438.

It is an arithmetic number, because the mean of its divisors is an integer number (75084120).

Almost surely, 2^405454221 is an apocalyptic number.

It is an amenable number.

405454221 is a deficient number, since it is larger than the sum of its proper divisors (195218739).

405454221 is a wasteful number, since it uses less digits than its factorization.

405454221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15016832 (or 15016826 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 405454221 is about 20135.8938465617. The cubic root of 405454221 is about 740.1401128653.

The spelling of 405454221 in words is "four hundred five million, four hundred fifty-four thousand, two hundred twenty-one".